Chemical Reactions Introduction

A chemical change differs from a physical change because

• Chemicals are used

• Molecules do not physically touch

• A new substance is formed and in a physical no new substance is formed

• The change can be seen but in a physical change it cannot

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_______________________ is represented with symbols and formulas, the identities and relative amounts of the reactants and products in a chemical reaction.

• Chemical reaction

• Chemical formula

• Chemical equation

• Lewis structure

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In a chemical reaction, the chemicals at the start of the reaction are called the _____.

• products

• reactants

• starters

• compounds

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A substance produced during a chemical reaction

• Product

• Reactant

• Properties

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What type of change occurs when a new substance is formed that has different properties from the original substances?

• chemical change
• nuclear change
• physical change
• mutation

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True or False
In a chemical reaction, no new atoms are created, and no atoms are destroyed. 

• true
• false

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The right side of the equation below is called the

• products
• reactants

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Combining substances to form a new substance

• Displacement
• Synthesis
• Decomposition
• Oxidation

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Breaking down a substance into simpler substances

• Displacement
• Synthesis
• Decomposition
• Oxidation

What type of reaction is the equation C + O₂ → CO₂?

• Synthesis Reaction
• Decomposition Reaction
• Single Displacement Reaction
• Double Displacement Reaction

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